<template>
    <div class="login_container">
      <div class="login_box">
        <div class="avatar_box">
          <img src="../assets/logo.png">
        </div>
        <!--登录表单区域-->
        <el-form ref="loginRef" :rules="rules" :model="loginForm" label-width="0px" class="login_form">
          <!--用户名-->
          <el-form-item prop="username">
            <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
          </el-form-item>
          <!--密码-->
          <el-form-item prop="password">
            <el-input v-model="loginForm.password" type="password" show-password prefix-icon="el-icon-lock"></el-input>
          </el-form-item>
          <!--按钮区域-->
          <el-form-item class="button">
            <el-button type="primary" @click="login">登录</el-button>
            <el-button type="info" @click="resetLoginForm">重置</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
</template>

<script>
export default {
  data () {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      rules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度为3到10个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度为6到15个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm () {
      this.$refs.loginRef.resetFields()
    },
    login () {
      this.$refs.loginRef.validate(async (valid) => {
        if (!valid) {
          return
        }
        const { data: result } = await this.$http.post('/login', this.loginForm)
        if (result.meta.status !== 200) {
          return this.$message.error('登陆失败!')
        }
        this.$message.success('登陆成功!')
        // 1.登录成功之后的token保存到客户端的sessionStorage中
        const token = result.data.token
        window.sessionStorage.setItem('token', token)
        // 1.1项目中唇线了登陆之外的API接口必须登录之后才能访问
        // 1.2token只应在当前网站打开期间生效，所以应该讲token保存在sessionStorage中
        // 2.编程式导航跳转到后台主页 路由地址为/home
        await this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
  .login_container{
    background-color: white;
    height: 100%;
  }
  .login_box{
    width: 450px;
    height: 300px;
    background-color: aliceblue;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
  }
  .avatar_box{
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
    img{
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
  .button{
    display: flex;
    justify-content: flex-end;
  }
  .login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
</style>
